A) the formation of a layer of cupric oxide on the surface of copper.
B) the formation of a layer of basic carbonate of copper on the surface of copper.
C) the formation of a layer of cupric hydroxide on the surface of copper.
D) the formation of basic copper sulphate layer on the surface of the metal.
Correct Answer: D
Solution :
Copper when exposed to moist air having \[C{{O}_{2}}.\]It gets superficially coated with a green layer of basic carbonate \[CuC{{O}_{3}}.Cu{{(OH)}_{2}}.\]
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